Prathibha, B.S., et al. “Inhibition of Mild Steel Corrosion in 1 M HCl Solution by 1-Propanaminium N,N,N-Tributyl Bromide”. Asian Journal of Chemistry, vol. 24, no. 5, Jan. 2012, pp. 2202-6, https://asianpubs.org/index.php/ajchem/article/view/8980.